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l2tp: Add support for zero IPv6 checksums 

Added new L2TP configuration options to allow TX and RX of
zero checksums in IPv6. Default is not to use them.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2014-05-23 08:47:40 -07:00 committed by David S. Miller
parent 1c19448c9b
commit 6b649feafe
4 changed files with 20 additions and 2 deletions
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2
include/uapi/linux/l2tp.h
View File

@ -124,6 +124,8 @@ enum {
L2TP_ATTR_STATS, /* nested */
L2TP_ATTR_IP6_SADDR, /* struct in6_addr */
L2TP_ATTR_IP6_DADDR, /* struct in6_addr */
L2TP_ATTR_UDP_ZERO_CSUM6_TX, /* u8 */
L2TP_ATTR_UDP_ZERO_CSUM6_RX, /* u8 */
__L2TP_ATTR_MAX,
};

9
net/l2tp/l2tp_core.c
View File

@ -1102,7 +1102,9 @@ static void l2tp_xmit_ipv6_csum(struct sock *sk, struct sk_buff *skb,
struct ipv6_pinfo *np = inet6_sk(sk);
struct udphdr *uh = udp_hdr(skb);
if (!skb_dst(skb) || !skb_dst(skb)->dev ||
if (udp_get_no_check6_tx(sk))
skb->ip_summed = CHECKSUM_NONE;
else if (!skb_dst(skb) || !skb_dst(skb)->dev ||
!(skb_dst(skb)->dev->features & NETIF_F_IPV6_CSUM)) {
__wsum csum = skb_checksum(skb, 0, udp_len, 0);
skb->ip_summed = CHECKSUM_UNNECESSARY;
@ -1435,6 +1437,11 @@ static int l2tp_tunnel_sock_create(struct net *net,
sizeof(udp6_addr), 0);
if (err < 0)
goto out;
if (cfg->udp6_zero_tx_checksums)
udp_set_no_check6_tx(sock->sk, true);
if (cfg->udp6_zero_rx_checksums)
udp_set_no_check6_rx(sock->sk, true);
} else
#endif
{

4
net/l2tp/l2tp_core.h
View File

@ -162,7 +162,9 @@ struct l2tp_tunnel_cfg {
#endif
u16 local_udp_port;
u16 peer_udp_port;
unsigned int use_udp_checksums:1;
unsigned int use_udp_checksums:1,
udp6_zero_tx_checksums:1,
udp6_zero_rx_checksums:1;
};
struct l2tp_tunnel {

7
net/l2tp/l2tp_netlink.c
View File

@ -161,6 +161,13 @@ static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info
cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
if (info->attrs[L2TP_ATTR_UDP_CSUM])
cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]);
#if IS_ENABLED(CONFIG_IPV6)
if (info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX])
cfg.udp6_zero_tx_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]);
if (info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX])
cfg.udp6_zero_rx_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]);
#endif
}
if (info->attrs[L2TP_ATTR_DEBUG])